1. Bell Peppers

2. Spinach

The moment it gets picked, spinach begins to lose antioxidants such as vitamin C and beta-carotene. Freezing preserves the nutrients for weeks.

3. Blueberries

Ken Lucas/Visuals Unlimited, Inc. via Getty Images

Frozen wild blueberries retain their high antioxidant content, no matter what the season.

4. Broccoli

moodboard via Getty Images

Broccoli is rich in the compound sulforaphane, which is thought to help protect against cancer. Yet the compound’s power fades over time. While frozen, however, broccoli retains the benefits for longer.

5. Fish

karandaev via Getty Images

Frozen wild Alaskan salmon fillets provide a good source of omega-3 fatty acids - and they’re a lot easier to get hold of than fresh, locally-caught produce.

6. Beans

Danita Delimont via Getty Images

Frozen beans provide all the convenience of canned with a lot less sodium and a big boost of iron and fibre.